The service was held at the First Congregational Church in Kingston, where Nancy Lanza once lived. Police Chief Donald Briggs had said only friends and family were invited.
She was the first victim of her 20-year-old son Adam's December 14 rampage, shot dead in their home before he blasted his way into Sandy Hook Elementary School in Newtown. He killed himself as police closed in.
Mourners lined up in 92-degree Fahrenheit (33-degree Celsius)heat to enter the church and a few of them cried upon exiting. A police officer played the bagpipes outside.
But friends said she never talked about her home life, keeping details about her son private. She occasionally said she was concerned about the future, but she didn't complain.
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Nancy Lanza told a divorce mediator in 2009 that she didn't like to leave her son alone. People who met him described him as shy and introverted. The mediator recalled that Nancy and Peter, who had married in June 1981 in Kingston but divorced several years ago, were respectful of each other and concerned about Adam's needs. He'd switched schools several times and Nancy had tried home schooling.
The motive for her son's killing spree is still unclear. Investigators have said mother and son visited shooting ranges together, and the victims killed at the school were all shot with a Bushmaster semi-automatic rifle that Adam Lanza took from the house he and his mother shared. That gun and the handgun he used to shoot himself had been legally purchased by his mother.